#!/bin/sh
#
# Add unlimited pmlc access from the local network to the default
# pmlogger.
#
# TODO IPv6?
#

# same function is in check-vm ... need to track changes
#
_getnetworkaddr()
{
    __verbose=false
    $very_verbose && __verbose=true
    if `which hostname >/dev/null 2>&1`
    then
	host=`hostname`
	if `which host >/dev/null 2>&1`
	then
	    host_out=`host $host`
	    if echo "$host_out" | grep ' has address ' >/dev/null
	    then
		addr=`echo "$host_out" | sed -e 's/.*address //'`
		$__verbose && echo "_getnetworkaddr: host -> addr=$addr" >&2
		if `which ifconfig >/dev/null 2>&1`
		then
		    # ifconfig line of interest looks like:
		    # inet 192.168.1.100  netmask 255.255.255.0  ...
		    # or
		    # inet addr:192.168.1.224  Bcast:192.168.1.255  Mask:255.255.255.0
		    # or
		    # inet 192.168.1.238/24 broadcast 192.168.1.255 flags 0x0
		    #
		    __config=`ifconfig | grep "[ :]$addr[ /]"`
		    if echo "$__config" | grep '[Mm]ask' >/dev/null
		    then
			mask=`echo "$__config" | sed -e 's/.*ask[ :]\([^ ][^ ]*\).*/\1/'`
		    elif echo "$__config" | grep " $addr/" >/dev/null
		    then
			mask=`echo "$__config" | sed -e '/\/24/s/.*/255.255.255.0/'`
		    else
			echo "_getnetworkaddr: botched config line: $__config" >&2
			mask=''
		    fi
		    $__verbose && echo "_getnetworkaddr: ifconfig -> mask=$mask" >&2
		    case "$mask"
		    in
			255.255.255.0|0xffffff00|ffffff00)	# /24 network
			    echo "$addr" | sed -e 's/\.[0-9]*$/.*/'
			    ;;
			# pmcd's [access] is not smart enough to handle other
			# than /24 networks, so map the other likely options
			# to the broader /24 network
			#
			255.255.255.128|255.255.255.192|255.255.255.224|255.255.255.240|255.255.255.248|255.255.255.252|255.255.255.254)
			    echo "$addr" | sed -e 's/\.[0-9]*$/.*/'
			    ;;
			*)
			    echo >&2 "_getnetworkaddr: Warning: cannot handle network mask: $mask"
			    ;;
		    esac
		elif `which ip >/dev/null 2>&1`
		then
		    # ip line of interest looks like:
		    # 4: br0    inet 192.168.1.100/24 ...
		    #
		    mask=`ip -f inet -o address | grep " $addr/" | sed -e 's/.*inet //' -e 's/[0-9.][0-9.]*\/\([^ ][^ ]*\) .*/\1/'`
		    $__verbose && echo "_getnetworkaddr: ip -> mask=$mask" >&2
		    if [ "$mask" != 24 ]
		    then
			# pmcd's [access] is not smart enough to handle other
			# than /24 networks, so map the other likely options
			echo >&2 "_getnetworkaddr: Warning: cannot handle network mask: $mask"
		    fi
		    # /24 netmask
		    mask=255.255.255.0
		    echo "$addr" | sed -e 's/\.[0-9]*$/.*/'
		else
		    echo >&2 "Neither ifconfig(1) nor ip(1)? Not sure how to get primary ip addr and netmask"
		fi
	    else
		echo >&2 "Unexpected host(1) output: $host_out ... cannot get ip addr and netmask"
	    fi
	else
	    echo >&2 "No host(1)? Not sure how to get primary ip addr and netmask"
	fi
    else
	echo >&2 "No hostname(1)? Not sure how to get primary ip addr and netmask"
    fi
}

tmp=/var/tmp/$$
sts=0
very_verbose=false
trap "rm -f $tmp.*; exit \$sts" 0 1 2 3 15

# add additional and optional directories
for dir in /sbin /usr/sbin
do
    if [ -d "$dir" ]
    then
	if echo ":$PATH:" | grep -q ":$dir:"
	then
	    :
	else
	    export PATH="$PATH:$dir"
	    #debug# echo add $dir to \$PATH
	fi
    fi
done

network=`_getnetworkaddr`

if [ -z "$network" ]
then
    echo "Arrgh ... cannot discover local network IP address"
    sts=1
    exit
fi

if [ -f /etc/pcp.conf ]
then
    . /etc/pcp.conf

    # TODO ... check in pmlogger for config file name ... other than
    # assuming config.default
    if [ -f $PCP_VAR_DIR/config/pmlogger/config.default ]
    then
	if [ -s $PCP_VAR_DIR/config/pmlogger/config.default ]
	then
	    if grep -q "allow $network" $PCP_VAR_DIR/config/pmlogger/config.default
	    then
		echo "Already done."
	    else
		cp $PCP_VAR_DIR/config/pmlogger/config.default $tmp.conf
		# TODO check for [access] at the end already?
		echo "allow $network : all;" >>$tmp.conf
		diff -u $PCP_VAR_DIR/config/pmlogger/config.default $tmp.conf
		sudo cp $tmp.conf $PCP_VAR_DIR/config/pmlogger/config.default
	    fi
	else
	    echo "Warning: \"$PCP_VAR_DIR/config/pcp/pmlogger/config.default\" is empty"
	    echo "         Need to start primary pmlogger once and try again."
	fi
    else
	echo "Warning: \"$PCP_VAR_DIR/config/pcp/pmlogger/config.default\" is missing"
	echo "         Need to start primary pmlogger once and try again."
    fi
else
    echo "Warning: \"/etc/pcp.conf\" is missing"
fi
